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A blocked defrost drain is one of the most common causes of water leaking from your refrigerator and is a good place to start troubleshooting. The small drain opening is easily blocked by food particles or ice, preventing water that accumulated during the defrost cycle from draining to the pan.
If the water pool inside the refrigerator is minor, it may merely condensation from the walls of the compartment that has run down to the bottom of the unit. Minor though the problem is, it's not normal. It's generally caused by excess heat and moisture in the refrigerator.